Halil, Nur Ihsan. “The Effectiveness of Using Edmodo As an Online Learning Platform in Covid-19”. Jurnal Penelitian Dan Pengkajian Ilmu Pendidikan: E-Saintika, vol. 4, no. 3, Nov. 2020, pp. 284-98, https://doi.org/10.36312/e-saintika.v4i3.316.